{
  "manageEntity": {
    "action": "Save",
    "entityId": "1302721966",
    "entityType": "Track",
    "nonce": "0xb413370f94b6cc744c55b449c3bf798a613a3beabdac2d40ca54b7805235528d",
    "signature": "0x66c08f04a3aa69ca3d6cd493362f8d8f80384f69a53e8e94fbec6a524a3dbd2249329f8268068a7162530273908c2d7500340c632444a185c6c5609552771d241c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}